Convert Snort 2 Custom IPS Rules to Snort 3

If you are using a rule set from a third-party vendor, contact that vendor to confirm that their rules successfully convert to Snort 3 or to obtain a replacement rule set written natively for Snort 3. If you have custom rules that you have written yourself, familiarize with writing Snort 3 rules prior to conversion, so you can update your rules to optimize Snort 3 detection after conversion. See the links below to learn more about writing rules in Snort 3.

• https://blog.snort.org/2020/08/how-rules-are-improving-in-snort-3.html

• https://blog.snort.org/2020/10/talos-transition-to-snort-3.html

You can refer to other blogs at https://blog.snort.org/ to learn more about Snort 3 rules.

See the following procedures to convert Snort 2 rules to Snort 3 rules using the system-provided tool.

• Convert all Snort 2 Custom Rules across all Intrusion Policies to Snort 3

• Convert Snort 2 Custom Rules of a Single Intrusion Policy to Snort 3

Important

Snort 2 network analysis policy (NAP) settings cannot be copied to Snort 3 automatically. NAP settings have to be manually replicated in Snort 3.